(11) باب الصَّلاَةِ قَبْلَ الْمَغْرِبِ
Narrated 'Abd Allah al-Muzani:
The Messenger of Allah (ﷺ) said: Pray two rak'ahs before the Maghrib prayer. He then said (again): Pray two rak'ahs before the Maghrib prayer, it applies to those who wish to do so. That was because he feared that the people might treat it as sunnah.
Reference: Sunan Abi Dawud 1281
In-book reference: Book 5, Hadith 32
English translation: Book 5, Hadith 1276